CN113624698B - Method for rapidly determining content of calcium carbonate and fiber in white water of cigarette paper - Google Patents
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- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 title claims abstract description 130
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 117
- 229910000019 calcium carbonate Inorganic materials 0.000 title claims abstract description 66
- 239000000835 fiber Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 40
- 235000019504 cigarettes Nutrition 0.000 title claims abstract description 36
- 238000002835 absorbance Methods 0.000 claims abstract description 44
- 239000000725 suspension Substances 0.000 claims abstract description 43
- 238000004519 manufacturing process Methods 0.000 claims abstract description 18
- 239000002253 acid Substances 0.000 claims abstract description 13
- 235000010216 calcium carbonate Nutrition 0.000 claims description 59
- 238000000870 ultraviolet spectroscopy Methods 0.000 claims description 24
- 238000010790 dilution Methods 0.000 claims description 12
- 239000012895 dilution Substances 0.000 claims description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 9
- 230000002572 peristaltic effect Effects 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 6
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 6
- 238000013178 mathematical model Methods 0.000 claims description 4
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 3
- 235000019253 formic acid Nutrition 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 6
- 238000004458 analytical method Methods 0.000 abstract description 5
- 239000000523 sample Substances 0.000 description 49
- 210000004027 cell Anatomy 0.000 description 18
- 210000003040 circulating cell Anatomy 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000010009 beating Methods 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000002371 ultraviolet--visible spectrum Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000003926 complexometric titration Methods 0.000 description 1
- 239000012470 diluted sample Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004255 ion exchange chromatography Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000003918 potentiometric titration Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000011122 softwood Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/3103—Atomic absorption analysis
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- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a method for rapidly determining the content of calcium carbonate and fiber in white water of cigarette paper, which comprises the steps of scanning the full wavelength of calcium carbonate and fiber standard suspension with known concentration by adopting an ultraviolet-visible spectrometer, establishing a corresponding standard curve, detecting white water under a diluted cigarette paper production line by adopting the ultraviolet-visible spectrometer, carrying out acidolysis treatment on a white water sample by acid, detecting the acidolysis sample by adopting the photometer, inputting absorbance values at specific wavelengths of the sample into the standard curve by adopting a difference method, and calculating to obtain the content of calcium carbonate and fiber in the white water sample; the method has the advantages of good accuracy, high precision and high analysis speed, can design a set of online monitoring platform based on the method, realizes the real-time online monitoring of the content of calcium carbonate and fiber in the white water system of the cigarette paper production line network, and has good application prospect.
Description
Technical Field
The invention relates to a method for rapidly determining the content of calcium carbonate and fiber in white water of cigarette paper, and belongs to the technical field of white water of paper making nets.
Background
Calcium carbonate is the main filler for producing cigarette paper, and can effectively improve whiteness, uniformity, air permeability and hand feeling of the cigarette paper. At present, the calcium carbonate used in the cigarette paper production process is light calcium carbonate, and the retention on paper is generally carried out by mechanical interception, electrostatic action between fibers and fillers and colloid adsorption. The cigarette paper is used as high-filling paper, and the addition amount of the light calcium carbonate in the production process is up to 30% -45%, so that the retention of the light calcium carbonate on the paper is limited, and a large amount of light calcium carbonate can flow into a net water system along with part of fine fibers, thereby influencing the recycling of the white water. In order to reduce the production cost of the cigarette paper and reduce the sewage treatment load of enterprises, and realize the closed recycling of the white water of the enterprise network for producing the cigarette paper, it is important to develop a set of analysis method for rapidly determining the content of calcium carbonate and fibers in the white water of the network.
At present, the quantitative analysis method of calcium carbonate in white water mainly comprises a calcination method, an ion chromatography method, a complexometric titration method, a potentiometric titration method and an atomic absorption method; the fiber content in the white water is measured mainly by gravimetric or optical length fiber analyzers. The method for simultaneously measuring the content of the fiber and the calcium carbonate in the white water is rarely reported, and only a small number of enterprises adopt a calcination method to simultaneously measure the content of the calcium carbonate and the fiber. However, this method is time consuming and the ash content affects the accuracy of the measurement due to the presence of other inorganic salts.
Disclosure of Invention
Aiming at the problems and the defects existing in the prior art, the invention adopts the ultraviolet-visible spectrophotometer, utilizes the curve relationship between the absorbance value generated by the calcium carbonate and fiber suspension liquid in a certain concentration at the characteristic wavelength in the visible light range and the corresponding concentration, develops a method for rapidly measuring the content of calcium carbonate and fiber in the web water in the cigarette paper production process, has good accuracy and high precision and high analysis speed, designs a set of online continuous monitoring device for the web water in the cigarette paper production process based on the invention, and is hopefully applied to the cigarette paper production process by inputting spectral information into a mathematical model, thereby realizing real-time online monitoring of the content of calcium carbonate and fiber in the web water system and further providing theoretical guidance and technical support for the closed recycling of the web water in the cigarette paper production enterprise.
The aim of the invention is achieved by the following technical scheme:
a method for rapidly determining the content of calcium carbonate and fiber in the water of cigarette paper production line comprises the following specific steps:
(1) Establishing a standard curve: preparing a series of standard calcium carbonate suspension and standard fiber suspension with a concentration respectively, placing the prepared suspensions in a cuvette respectively, starting a photometer to detect the suspensions with known concentration to obtain absorbance values under the wavelength lambda, and respectively obtaining an absorbance value-standard curve of the calcium carbonate suspension concentration and an absorbance value-standard curve of the fiber suspension concentration according to the obtained absorbance values and the corresponding relations between the calcium carbonate suspension concentration and the fiber suspension concentration;
(2) Dilution of white water sample: taking white water under a cigarette paper production net, and adding water for dilution to obtain a diluted white water sample;
(3) Detection of a thin white water sample: placing the diluted white water sample in the step (2) in a cuvette, and starting a photometer to detect the diluted white water sample to obtain an absorbance value A at a wavelength lambda 1 ；
(4) Acidolysis of dilute white water samples: at room temperature, adding acid into the diluted white water sample diluted in the step (2) for acidolysis, and starting a photometer to detect the acidolysis to obtain an absorbance value A at a wavelength lambda 2 ；
(5) Establishing a mathematical model: based on the standard curve obtained in the step (1), absorbance value A of the sample before and after acidolysis obtained in the step (3) and the step (4) at wavelength lambda 1 And A 2 The calculation model of the content of calcium carbonate and fiber in the sample can be obtained by a difference method, and the calculation model is specifically represented by the following formulas (1) and (2):
wherein:
c CaCO3 -the content of calcium carbonate in the sample, mg/L;
c fiber -the content of fibres in the sample, mg/L;
A 1 -absorbance of the white water sample at wavelength λ before acidolysis;
A 2 -absorbance of white water sample at wavelength λ after acidolysis;
r is the dilution multiple of white water samples;
s-absorbance value-slope of standard curve of calcium carbonate suspension concentration;
f-luminosity value-slope of standard curve of fiber suspension concentration.
Preferably, the wavelength λ is a wavelength 400nm.
Preferably, the standard calcium carbonate suspension in step (1) has a concentration in the range of 0.15-0.75g/L.
Preferably, the concentration of the standard fibre suspension in step (1) is in the range of 0.10-0.31g/L.
Preferably, the photometer in step (1) is an ultraviolet-visible photometer.
Preferably, the dilution factor of the white water in step (2) is 5-10 times.
Preferably, the dilute acid in step (4) is hydrochloric acid or formic acid or acetic acid at a concentration of 0.25-1 mol/L.
Preferably, the pH value of the diluted white water sample added with the acid in the step (4) is less than or equal to 7.
Preferably, the acidolysis time in step (4) is 30-40s.
The device matched with the method comprises a sample cell 1, a peristaltic pump 2, an ultraviolet-visible spectrophotometer I3, an acidolysis cell 4, an ultraviolet-visible spectrophotometer II 5, a computer terminal 6 and a white water circulating cell 7, wherein the sample cell 1 is connected with the white water circulating cell 7 and a clean water tank, the sample cell 1 is connected with the ultraviolet-visible spectrophotometer I3, the ultraviolet-visible spectrophotometer I3 is also connected with the acidolysis cell 4 through the peristaltic pump 2, the acidolysis cell 4 is connected with the ultraviolet-visible spectrophotometer II 5, the ultraviolet-visible spectrophotometer II 5 is connected with the white water circulating cell 7, and the ultraviolet-visible photometer I3 and the ultraviolet-visible photometer II 5 are respectively connected with the computer terminal 6.
Compared with the prior art, the invention has the following advantages and effects:
(1) Compared with the prior art, the method provided by the invention has the advantages that the content of calcium carbonate and fiber in white water is measured by an ultraviolet-visible spectrophotometer, and the requirement of measuring the concentration of two substances simultaneously can be met.
(2) The method has the advantages of good accuracy, high precision and high analysis speed, the test relative deviation is less than +/-5.0%, and the recovery rate is between 95% and 106%.
(3) The online monitoring platform device designed based on the method is expected to be applied to the cigarette paper production process, and realizes real-time online monitoring of the content of calcium carbonate and fiber in a white water system under a cigarette paper production line.
Drawings
FIG. 1 is a graph of UV-visible spectrum versus wavelength absorbance for calcium carbonate suspensions of example 1 at different concentrations;
FIG. 2 is a graph of absorbance versus concentration for the calcium carbonate suspension of example 1 at 400 nm;
FIG. 3 is a graph of UV-visible spectrum versus degree versus wavelength absorbance for fiber suspensions of different concentrations of example 1;
FIG. 4 is a graph of absorbance versus concentration for the fiber suspension of example 1 at 400 nm;
FIG. 5 is a schematic view of the structure of the device of example 2;
in the figure, a sample cell, a 2-peristaltic pump, a 3-ultraviolet-visible light photometer I, a 4-acidolysis cell, a 5-ultraviolet-visible light photometer II, a 6-computer terminal and a 7-white water circulation cell are arranged;
FIG. 6 shows the results of the real-time measurement of example 2.
Detailed Description
The present invention will be described in further detail with reference to the drawings and detailed description, and the invention is not limited to the following embodiments.
Example 1
A method for rapidly determining the content of calcium carbonate and fiber in white water of cigarette paper comprises the following specific steps:
(1) Establishing a standard curve:
preparing standard calcium carbonate suspension with a series of concentrations, selecting 0.15g/L, 0.3g/L, 0.45g/L, 0.60g/L and 0.75g/L from the concentration range of 0.15-0.75g/L, preparing, placing the prepared suspensions in a cuvette, respectively, starting an ultraviolet-visible spectrophotometer to detect the suspensions with known concentrations, scanning with a scanning range of 200-600nm to obtain absorbance values at a wavelength of 200-600nm, and obtainingThe correspondence between absorbance values and calcium carbonate suspension concentration is fitted as shown in fig. 1, and a standard curve i of absorbance values-calcium carbonate suspension concentration at a wavelength of 400nm is obtained: abs=1.14c CaCO3 (R 2 = 0.9981), as shown in fig. 2;
preparing a series of standard fiber suspensions with concentration, selecting the concentration of 0.10g/L, 0.15g/L, 0.21g/L, 0.26g/L and 0.31g/L from the concentration range of 0.10-0.31g/L to prepare, respectively placing the prepared suspensions into a cuvette, starting an ultraviolet-visible spectrophotometer to detect the suspensions with known concentration, scanning the suspensions with the scanning range of 200-600nm to obtain absorbance values at the wavelength of 200-600nm, fitting the obtained absorbance values and the corresponding relation between the fiber suspension concentrations as shown in fig. 3 to obtain a standard curve II of absorbance values-fiber suspension concentration at the wavelength of 400 nm: abs=1.51c fiber (R 2 = 0.9937), as shown in fig. 4;
(2) Dilution of white water sample: taking white water under a cigarette paper production net, adding water for dilution by 5 times, and obtaining a diluted white water sample;
(3) Detection of a thin white water sample: placing the diluted white water sample in the step (2) into a cuvette, starting an ultraviolet-visible spectrophotometer to detect the diluted white water sample, and scanning the diluted white water sample in the step (2) within a range of 200-600nm to obtain an absorbance value A at a wavelength of 400nm 1 ；
(4) Acidolysis of dilute white water samples: taking 10mL of the diluted white water sample in the step (3) at room temperature, adding 0.6mL of 0.25mol/L diluted hydrochloric acid solution into the diluted white water sample, carrying out acidolysis treatment for 30s, starting an ultraviolet-visible spectrophotometer to detect the diluted white water sample after acidolysis, and obtaining an absorbance value A at a wavelength of 400nm, wherein the pH value of the diluted white water sample after adding acid is less than or equal to 7, and the scanning range is 200-600nm 2 ；
(5) Establishing a mathematical model: based on the standard curve obtained in the step (1), absorbance value A of samples before and after acidolysis obtained in the step (3) and the step (4) at the wavelength of 400nm 1 And A 2 The calculation model of the content of calcium carbonate and fiber in the sample can be obtained by a difference method, and the calculation model is specifically represented by the following formulas (1) and (2):
wherein:
c CaCO3 -the content of calcium carbonate in the sample, mg/L;
c fiber -the content of fibres in the sample, mg/L;
A 1 -absorbance of the white water sample at wavelength λ before acidolysis;
A 2 -absorbance of white water sample at wavelength λ after acidolysis;
r is the dilution multiple of white water samples;
s-absorbance value-slope of standard curve of calcium carbonate suspension concentration;
f-luminosity value-slope of standard curve of fiber suspension concentration; the above formula ignores the effect of acid added during acidolysis on volume.
The accuracy of the formula is verified, and the specific steps are as follows:
(1) Simulation white water sample preparation: mixing broad-leaved wood with beating degree of 40 degrees SR and softwood pulp with beating degree of 90 degrees SR according to absolute dry ratio of 7:3, adding water to prepare calcium carbonate and fiber mixed suspension with concentration almost equal to that of the existing white water, diluting by different times, and the concentration of diluted white water sample is shown in Table 1;
(2) Simulation of detection of white water sample: placing the white water simulating sample obtained in the step (2) into a cuvette, measuring by an ultraviolet-visible spectrophotometer, scanning in a range of 200-600nm, and recording absorbance A at 400nm 1 ；
(3) Simulation of acidolysis of white water samples: taking 10mL of the simulated white water sample in the step (3), adding 0.6mL of 0.25mol/L dilute hydrochloric acid solution into the simulated white water sample at room temperature, and carrying out acidolysis treatment for 30s, wherein the pH value of the dilute white water sample after acid addition is less than or equal to 7;
(4) White water sample simulationAnd (3) detecting products: placing the simulated white water sample after acidolysis in the step (4) in a cuvette, measuring by an ultraviolet-visible spectrophotometer, scanning the white water sample in a range of 200-600nm, and recording an absorbance value A at a wavelength of 400nm 2 ；
(5) The absorbance value A at the wavelength of 400nm obtained in the step (2) and the step (4) is obtained 1 And A 2 With formulas (1) and (2), the measured concentrations of calcium carbonate and fibers in the simulated white water sample were calculated, and the test results are shown in table 1.
TABLE 1
The recovery rate experiment was performed on this example, and the results are shown in table 2:
TABLE 2
It can be seen from tables 1 and 2 that the measured and actual amount deviations are very small, within + -5% and recovery rates between 95% -106%, indicating that the method established by this example is feasible.
According to practical cases, the dilution factor of the white water in example 1 was 5 to 10 times, the acid was hydrochloric acid or formic acid or acetic acid having a concentration of 0.25 to 1mol/L, and the acidolysis time was 30 to 40s, and it was concluded that the same as in example 1 could be achieved by fluctuating in these ranges.
Example 2
The device for rapidly determining the content of calcium carbonate and fiber in the water of cigarette paper production line is a platform established based on the method of the embodiment 1, and as shown in fig. 5, the device comprises a sample cell 1, a peristaltic pump 2, an ultraviolet-visible spectrophotometer I3, an acidolysis cell 4, an ultraviolet-visible spectrophotometer II 5, a computer terminal 6 and a white water circulation cell 7, wherein the sample cell 1 is connected with the white water circulation cell 7 and the clean water tank, the sample cell 1 is connected with the ultraviolet-visible spectrophotometer I3, the ultraviolet-visible spectrophotometer I3 is also connected with the acidolysis cell 4 through the peristaltic pump 2, the acidolysis cell 4 is connected with the ultraviolet-visible spectrophotometer II 5, the ultraviolet-visible spectrophotometer II 5 is connected with the white water circulation cell 7, and the ultraviolet-visible photometer I3 and the ultraviolet-visible photometer II 5 are respectively connected with the computer terminal 6, and the use steps are as follows:
(1) Formulas (1) and (2) obtained by the method of example 1 are incorporated into a computer terminal 6;
(2) Pumping the white water in the white water circulating pool 7 into the sample pool 1, adding clear water into the sample pool 1, diluting the white water to five times of the original volume, and detecting the diluted sample in an ultraviolet-visible spectrophotometer I3 to obtain an absorbance value A at 400nm 1 And transmits the signal value to the computer terminal 6;
(3) Pumping diluted white water in an ultraviolet-visible spectrophotometer I3 into an acidolysis tank 4 by using a peristaltic pump 2, adding hydrochloric acid with the concentration of 1mol/L into the acidolysis tank 4 according to the volume ratio of white water to acid liquor of 10:0.4, adding the pH value of a diluted white water sample with the acid of less than or equal to 7, performing acidolysis treatment for 40 seconds, detecting in an ultraviolet-visible spectrophotometer II 5, and recording absorbance value A at 400nm 2 And transmits the signal value to the computer terminal 6;
(4) The contents of calcium carbonate and fiber in white water of cigarette paper are obtained by adopting the formulas (1) and (2) stored in the computer terminal 6, and are output as measured values, detection is carried out every 45s, fig. 6 is a detection result, the calcium carbonate and fiber in the white water are monitored in real time, and if the condition of large fluctuation of data occurs, the production process is checked.
The method has the advantages of good accuracy, high precision and high analysis speed, can realize real-time online monitoring of the white water system under the cigarette paper production line, and effectively overcomes the defects of the existing method for detecting the content of calcium carbonate and fibers in white water.
The embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, simplifications, and equivalents may be made without departing from the spirit and principles of the present invention, which are to be included in the scope of the present invention.
Claims (10)
1. A method for rapidly determining the content of calcium carbonate and fiber in white water of cigarette paper is characterized by comprising the following specific steps:
(1) Establishing a standard curve: preparing a series of standard calcium carbonate suspension and standard fiber suspension with a concentration respectively, starting a photometer to detect the suspension with a known concentration to obtain an absorbance value at a wavelength lambda, and respectively obtaining a standard curve of absorbance value-calcium carbonate suspension concentration and a standard curve of absorbance value-fiber suspension concentration according to the obtained absorbance value and the corresponding relation between the concentration of the calcium carbonate suspension and the concentration of the fiber suspension;
(2) Dilution of white water sample: taking white water under a cigarette paper production net, and adding water for dilution to obtain a diluted white water sample;
(3) Detection of a thin white water sample: detecting the diluted white water sample in the step (2) by adopting a photometer to obtain an absorbance value A at the wavelength lambda 1 ；
(4) Acidolysis of dilute white water samples: at room temperature, adding acid into the diluted white water sample diluted in the step (2) for acidolysis, and starting a photometer to detect the acidolysis to obtain an absorbance value A at a wavelength lambda 2 ；
(5) Establishing a mathematical model: based on the standard curve obtained in the step (1), absorbance value A of the sample before and after acidolysis obtained in the step (3) and the step (4) at wavelength lambda 1 And A 2 The calculation model of the content of calcium carbonate and fiber in the sample can be obtained by a difference method, and the calculation model is concretely as follows:
wherein:
c CaCO3 -the content of calcium carbonate in the sample, mg/L;
c fiber -the content of fibres in the sample, mg/L;
A 1 -absorbance of the white water sample at wavelength λ before acidolysis;
A 2 -absorbance of white water sample at wavelength λ after acidolysis;
r is the dilution multiple of white water samples;
s-absorbance value-slope of standard curve of calcium carbonate suspension concentration;
f-absorbance value-slope of standard curve of fiber suspension concentration.
2. The method for rapidly determining the calcium carbonate and fiber content in white water of cigarette paper according to claim 1, wherein the wavelength λ is 400nm.
3. The method for rapid determination of calcium carbonate and fiber content in white water of cigarette paper according to claim 1, wherein the standard calcium carbonate suspension in step (1) has a concentration of 0.15-0.75g/L.
4. The method for rapid determination of calcium carbonate and fiber content in white water of cigarette paper according to claim 1, wherein the standard fiber suspension in step (1) has a concentration of 0.10-0.31g/L.
5. The method for rapidly determining the calcium carbonate and fiber content of white water of cigarette paper according to claim 1, wherein the photometer in step (1) is an ultraviolet-visible spectrophotometer.
6. The method for rapidly determining the calcium carbonate and fiber content of white water of cigarette paper according to claim 1, wherein the dilution factor of white water in step (2) is 5-10 times.
7. The method for rapidly determining the calcium carbonate and fiber content in white water of cigarette paper according to claim 1, wherein the acid in step (4) is hydrochloric acid, formic acid or acetic acid with a concentration of 0.25-1 mol/L.
8. The method for rapidly determining the content of calcium carbonate and fiber in white water of cigarette paper according to claim 1, wherein the pH value of the diluted white water sample after adding acid in step (4) is 7 or less.
9. The method for rapidly determining the calcium carbonate and fiber content in white water of cigarette paper according to claim 1, wherein the acidolysis time in step (4) is 30-40s.
10. The method for rapidly determining the content of calcium carbonate and fiber in white water of cigarette paper according to claim 1, wherein the matched device comprises a sample tank (1), a peristaltic pump (2), an ultraviolet-visible photometer I (3), an acidolysis tank (4), an ultraviolet-visible photometer II (5), a computer terminal (6) and a white water circulating tank (7), wherein the sample tank (1) is connected with the white water circulating tank (7) and a clean water tank, the sample tank (1) is connected with the ultraviolet-visible photometer I (3), the ultraviolet-visible photometer I (3) is also connected with the acidolysis tank (4) through the peristaltic pump (2), the acidolysis tank (4) is connected with the ultraviolet-visible photometer II (5), the ultraviolet-visible photometer II (5) is connected with the white water circulating tank (7), and the ultraviolet-visible photometer I (3) and the ultraviolet-visible photometer II (5) are respectively connected with the computer terminal (6).
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| CN101424634A (en) * | 2008-12-05 | 2009-05-06 | 华南理工大学 | Method for rapidly measuring organic substance concentration in paper making white water |
| CN102507483A (en) * | 2011-10-12 | 2012-06-20 | 云南省烟草质量监督检测站 | Method for determining content of calcium carbonate in cigarette paper |
| CN112326576A (en) * | 2020-11-20 | 2021-02-05 | 云南省烟草质量监督检测站 | Continuous flow method for determining content of calcium carbonate in paper-making reconstituted tobacco |
| CN112525895A (en) * | 2020-11-20 | 2021-03-19 | 云南省烟草质量监督检测站 | Continuous flow method for measuring content of calcium carbonate in cigarette paper |
| CN112525889A (en) * | 2020-11-20 | 2021-03-19 | 云南省烟草质量监督检测站 | CFA-FP method for determining content of calcium carbonate in cigarette paper |
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